Journal
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
Volume 75, Issue 11, Pages 3389-3395Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.02240-08
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Funding
- Danida research fellowship
- Danish Research Agency
- Ministry of Science Technology and Innovation [2104-05-0003]
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Electricity generation from wheat straw hydrolysate and the microbial ecology of electricity-producing microbial communities developed in two-chamber microbial fuel cells (MFCs) were investigated. The power density reached 123 mW/m(2) with an initial hydrolysate concentration of 1,000 mg chemical oxygen demand (COD)/liter, while coulombic efficiencies ranged from 37.1 to 15.5%, corresponding to the initial hydrolysate concentrations of 250 to 2,000 mg COD/liter. The suspended bacteria found were different from the bacteria immobilized in the biofilm, and they played different roles in electricity generation from the hydrolysate. The bacteria in the biofilm were consortia with sequences similar to those of Bacteroidetes (40% of sequences), Alphaproteobacteria (20%), Bacillus ( 20%), Deltaproteobacteria ( 10%), and Gammaproteobacteria ( 10%), while the suspended consortia were predominately Bacillus ( 22.2%). The results of this study can contribute to improving understanding of and optimizing electricity generation in microbial fuel cells.
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